Gremlin. “Grimm-Lin!” [1.] a gremlin denoting a mischievous creature that sabotages aircraft originates in Royal Air Force (RAF) slang in the 1920s among the British pilots stationed in Malta, the Middle East, and India, with the earliest recorded printed in the second World War, on U.S. currency when a “Dick Canidy, OSS,” aka one time traveling “Paul T. Black, n6bbz,” borrowed a bird from Granpa’s old air field with his bride and bolted.